Edward Snowden has drawn attention to David Cameron’s apparently new interest in privacy, in the wake of questions about his family’s tax affairs.

The Prime Minister avoided questions about his tax situation, following mentions of his father Ian Cameron in the “Panama papers”. Mr Cameron has looked to argue that his tax affairs are not public and so shouldn’t be discussed.

Sharing a tweet about Mr Cameron’s spokesperson’s comment that his tax affairs are a “private matter”, Mr Snowden suggested that the focus on privacy was a new interest. “Oh, now he’s interested in privacy,” the whistleblower wrote in a tweet that was shared over 18,000 times.

David Cameron’s government has received sustained criticism from privacy campaigners, including those within his own party. One of its most high-profile pieces of legislation has been the Investigatory Powers Bill, or Snoopers’ Charter – an attempt to revive an earlier version of a similar law that was stopped when the Liberal Democrats were in government.

That law gives spies, police forces and a range of other authorities the apparent power to break into phones and force their manufacturers to help them do it. It also appears to weaken much of the security powers that are already in phones and computers, including encryption – the technology that powers WhatsApp and iMessage.

David Cameron introduced that effort to weaken security in the wake of the Charlie Hebdo shootings at the beginning of 2014. “In our country, do we want to allow a means of communication between people which […] we cannot read?” he asked in the wake of those attacks, in remarks that were the beginning of a fight between the Government and privacy campaigners that is still going on.